In addition to their racial abilities, all characters gain one of these 'senses' for free.
Treasure Finder and Sixth Sense count as one sense.

Path finding: You, tend to have a 'knack' for knowing which direction to take to a particular
  destination.  You may always take-10 on navigation and survival rolls to find a particular
  location.

Analyze: You know about all kinds of creatures, their habitats, weaknesses, and natures.  You
  may take-10 on any knowledge check regarding a creature, and will always be able to determine
  at least one strength or weakness of the monster.

Treasure Finder: This ability allows you to locate treasure particularly easily.  You
  may always take-10 on a search check when looking for treasure.

Sixth Sense: You are extremely aware of your surroundings, and can spot telltale signs
  of monsters nearby.  Therefore, you may always take-10 on listen and spot checks.